AMT-70/AMT-73/AMT-75 Installation and Operation
8.5 HSSI Connector Pin-Outs
The HSSI cable pin-outs (P3 on AMT-70 and J18 on the AMT-73L) are as follows;
Figure 49: HSSI Data Interface Pin-Outs
Pin #
(+ side)
Pin #
(- side)
Direction
DTE-DCE
Signal Name
1 26 SC --- Signal common
2 27 RT <-. Receive Timing
3 28 DSR <-. DCE Available
4 29 RD <-. Receive Data
5 30 LC <-. Loopback Circuit C
6 31 ST <- Transmit Signal Element Timing
7 32 SC --- Signal Ground
8 33 DTR .-> DTE Ready
9 34 TT
.->
Transmit Signal Element Timing
10 35 LA .-> Loopback Circuit A
11 36 SD .-> Send Data
12 37 LB .-> Loopback Circuit B
13 38 SG --- Signal Ground
14-18 39-43 .-> 5 Ancillary to DCE
19 44 SG --- Signal Ground
20-23 45-48 4 Ancillary from DCE
24 49 Test Mode
8.6 RJ-45 Ethernet M&C Connector Pin-Outs
The 10/100BaseT Ethernet M&C connection utilizes a RJ-45 connector, as shown in the following
figure, which also depicts the arrangement of the pins, looking into the connector. There are two
Ethernet connectors, one for the demodulator only (P1 on the AMT-70 and J10 on the AMT-73L)
and one for the modulator and demodulator (P6 on the AMT-70 and J9 on the AMT-73L).
Use of the demodulator only Ethernet port is intended for factory testing and updating demodulator
software changes. The modulator and demodulator Ethernet port should be used for
communications with the modem during normal usage.
Figure 50: Ethernet RJ-45 Connector Pin-Outs
RJ-45 Pin Number Description Wire Color Codes Crossover Cable Pins
1 TX +
White w/Orange
3
2 TX -
Orange
6
3 RX +
White w/Green
1
4
Blue
5
White w/Blue
6 RX -
Green
2
7
White w/Brown
8
Brown
110
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General